Thank you all for your response
Jake - thank you for clarification and yes you are correct. Application
works like checksum validation server,client. Terminate is only useful if
user triggered server to download a very large file but figured wrong
setting present and i.e. does ctrl+c on client yet still it is matter of
seconds. For the exact same reason I have postponed but I wanted to
investigate if there is a way. I will give a shot this weekend for the
io.Reader
Burak
On Friday, November 1, 2019 at 4:54:00 PM UTC+1, Jake Montgomery wrote:
>
> On Friday, November 1, 2019 at 10:30:50 AM UTC-4, Shulhan wrote:
>>
>>
>> On Fri, 1 Nov 2019, 21:07 burak sarac, <bura...@gmail.com> wrote:
>>
>>> I have a go routine running something like 'hash.sum(data)' using import
>>> "hash" that I want to terminate immediately in case of user wants to
>>> kill, I can not send channel to notify.
>>>
>>
>>
>> I have not tried this, but you can use a combination of defer, panic and
>> recover to unroll the process.
>>
>> The recover function is inside calculate, and the for-loop is running in
>> goroutine before calculate.
>>
>> defer func() { recover() }
>> go loop()
>> calculate()
>>
>> Inside the loop() you will call panic("terminate").
>>
>> -- Shulhan
>>
>
> Shulhan - I think the point was that Burak does not have control over the
> code for the function that we want to interrupt. So he has no ability to
> insert a panic.
>
> Burak - I do not believe there is a generic way to interrupt a function or
> goroutine which does not take a Context, or have some other interruption
> method baked in. I know the idea of being able to "kill" a goroutine has
> been discussed before, and has generally gone nowhere.
>
> It might be useful to have more details of the call, and to understand why
> you need to interrupt this function. Assuming the hash.sum() you refer to
> takes a []byte, then how long could it reasonably take? The best bet might
> be to simply let it finish and ignore the result. Of course, if the
> function is being sourced off an io.Reader(), or something like that, then
> you might be able to interrupt the stream by wrapping the interface with
> some of your own code.
>
>
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